Patent US3324664A successfully refreshed from Google Patents.
US3324664A
Expired / Lapsed
US
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Resilient biasing device for mine roof support props
Assignee: Gullick Ltd
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Filing: 1965-03-30
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Granted: 1967-06-13
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Expires: 1985-03-30
Abstract
No abstract record available.
Inventors
- 👤 Allen Archelaius Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:51
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/006; E21D23/0069; E21D23/04; E21D23/0418
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A MINE ROOF SUPPORT COMPRISING A BASE, AT LEAST ONE PRESSURE-FLUID EXTENSIBLE PROP MOUNTED ON SAID BASE FOR UNIVERSAL TILTING MOVEMENT OUT OF THE VERTICAL, A FIXED ANCHORAGE ON SAID BASE AND A LEAF-SPRING DEVICE, WHICH IS U-SHAPED IN PLAN, HAVING ONE OF ITS RESILIENT ARMS SECURED AT ITS END TO SAID FIXED ANCHORAGE AND ITS OTHER RESILIENT ARM AT ITS END ENGAGING THE PROP THEREBY TO BIAS SAID PROP TOWARDS A PREDETERMINED POSITION WHATEVER THE DIRECTION IN WHICH IT HAS BEEN MOVED FROM SAID POSITION.
Claim 2
Dependent Claim
86 words
A MINE ROOF SUPPORT COMPRISING A BASE, AT LEAST ONE PRESSURE-FLUID EXTENSIBLE PROP MOUNTED ON SAID BASE FOR UNIVERSAL TILTING MOVEMENT OUT OF THE VERTICAL, A FIXED ANCHORAGE ON SAID BASE AND A LEAF-SPRING DEVICE, WHICH IS U-SHAPED IN PLAN, HAVING ONE OF ITS RESILIENT ARMS SECURED AT ITS END TO SAID FIXED ANCHORAGE AND ITS OTHER RESILIENT ARM AT ITS END ENGAGING THE PROP THEREBY TO BIAS SAID PROP TOWARDS A PREDETERMINED POSITION WHATEVER THE DIRECTION IN WHICH IT HAS BEEN MOVED FROM SAID POSITION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-12 | 1970-12-12 | 1971-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-12 | 1974-12-12 | 1975-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-12 | 1978-12-12 | 1979-06-13 | $7700.00 | Window Closed / Lapsed |